Bad Friend System: Come On, Friend, Take This On!

After failing a mission, the agent Phantom Seventeen transmigrates and is reborn in a remote village in an alternate ancient world. She comes with a Bad Friend System: harm her friends' interests to earn Bad Friend Points, which can be exchanged for ten billion in modern cash and a trip back to the present day. If she fails a mission, the System will impose a random punishment, and the missions keep coming until she succeeds.

Other people make friends to have fun!

Phantom Seventeen makes friends so she can scam them...

Basically, whoever counts as her friend is in for a rough time...

Friends of the ancient world, here I come...